Installation manual
9
RR+RQ71+10 RR+RQ71~125B7W1B
Split System air conditioners
4PW19370-1C
Example 1
1
G1=L1+L2=35+7=42 m
G2=L3=5
2
Over
30
m
a
G1
–
30=12 m
➙
Ø9.5 R1=1.00 kg
b
G2=5 m
➙
Ø6.4 R2=0.30 kg
3
Refrigerant charge amount=R=R1+R2=1.00+0.30=1.30 kg
Example 2
1
G1=L1=5 m
G2=L2+L3+L4=17+17+20=54
2
Over
30
m
a
G1=5 m
➙
R1=0.0 kg
b
(G1+G2)
–
30=(5+54)
–
30=29
➙
Ø6.4 R2=0.90 kg
3
Refrigerant charge amount=R=R1+R2=0.0+0.9=0.9 kg
Total charging weight of the refrigerant (after a leak,
etc.)
When the entire refrigerant pipe length is within 30 meters, charge
the refrigerant in accordance with the amount mentioned in the
nameplate, and when the pipe length exceeds 30 meters, the
charging amount mentioned in the nameplate and that required for
additional charging are to be totalled as the net charging amount.
Precaution for pumping-down operation
The outdoor unit is equipped with a low-pressure switch to protect the
compressor.
Take the following steps to perform the pumping-down operation.
This is the end of pumping-down operation. After pumping-down
operation, the remote controller can show the following:
-
"U4"
-
blank screen
-
indoor fan operates for about 30 seconds
Even when the ON button on the remote controller is pressed, it will
not operate. Turn off the main power supply switch and turn it on
again in need of operation.
E
LECTRICAL
WIRING
WORK
L2=7 (Ø9.5)
71 type
100 type
L1=35 (Ø9.5)
indoor
L3=5 (Ø6.4)
35 type
outdoor heat pump
L2=17 (Ø6.4)
50 type
indoor
125 type
L1=5 (Ø9.5)
L3=17 (Ø6.4)
50 type
outdoor heat pump
indoor
L4=20 (Ø6.4)
50 type
NOTE
In case of complete recharge of the refrigerant, please first
execute vacuuming. Execute this vacuuming from the
service port. Do not use the port of the stop valve for
vacuuming. Vacuuming can not be executed completely
using such port.
Position of service port:
Heat pump: Heat pump units have 2 ports on the
piping. One between the liquid receiver and the
electronic expansion valve and another one between
the heat exchanger and the 4-way valve.
Cooling only: On the discharge pipe
NOTE
Never short-circuit the low pressure switch in this
operation.
Procedure
Precaution
1
Put a pressure gauge at the
service port of the gas stop
valve.
Use a pressure gauge
reserved for R-410A
exclusively.
2
Start the fan operation with the
remote controller.
Confirm that stop valves both
on the liquid and gas side are
open.
3
Push the pumping-down
button on the PC board of the
outdoor unit.
Compressor and outdoor fan
will start operation
automatically.
If step 3 is performed before
step 2, then the indoor fan
may automatically start
running. Please pay attention
to this.
4
Continue operation for
2 minutes until operation
condition stabilizes.
—
5
Close the stop valve on the
liquid side securely. (See
"How
to use the shut-off valve" on
page 6
)
Insecure closing of the valve
may result in burning of the
compressor.
6
When the low-pressure switch
is activated, the unit stops
working. At this time, close the
stop valve on the gas side.
—
■
All wiring must be performed by an authorized
electrician.
■
All components procured on the site and all electric
construction should comply with the applicable local
and national codes.
■
High voltage
To avoid electrical shock, make sure to disconnect the
power supply 1 minute or more before servicing the
electrical parts. Even after 1 minute, always measure
the voltage at the terminals of main circuit capacitors
or electrical parts and, before touching, make sure
that those voltages are 50 V DC or less.
NOTE
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
